.equation{grid-template-columns:1fr .55fr 1fr .55fr 1fr;align-items:center}.equation .operator{font-size:clamp(28px,5vw,48px);font-weight:800}.equation .number-cell{min-width:0}.equation .missing:focus-visible{outline:3px solid #427fab;outline-offset:5px}@media(max-width:500px){.equation{gap:4px;padding:12px}.equation .number-cell,.equation .number-cell.missing{font-size:32px;min-height:60px}.math-label{letter-spacing:0}}